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Finding the Fourth Proportional to 1,786.20, 2,464.71 and 989.46

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Solution

The fourth proportional to 1,786.20, 2,464.71 and 989.46 is: 1,365.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.20 : 2,464.71 = 989.46 : x
  2. Step 2: Convert to fraction form
    1,786.20/2,464.71 = 989.46/x
  3. Step 3: Cross multiply
    1,786.20x = 2,464.71 × 989.46
  4. Step 4: Simplify right side
    1,786.20x = 2,438,731.96
  5. Step 5: Solve for x
    x = 2,438,731.96/1,786.20
  6. Step 6: Final answer
    x = 1,365.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.